bzr crashed on commit after merge from local branch to "svn" working copy

The order of operations:
1. I have a local bazaar branch from SVN (made with bzr checkout), name id "abc"
2. I've made a branch with "bzr branch abc abc_branch"
3. Working on branch
4. Merging back: "bzr merge ../abc_branch"
5. Trying to commit: "bzr commit" -> CRASH
6. "bzr up" now gives the crash too

Here is the output:

bzr: ERROR: exceptions.KeyError: 'missing revision paths for 11863'

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3689, in run
    lossy=lossy)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree_4.py", line 218, in commit
    result = WorkingTree.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 203, in commit
    possible_master_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 187, in update_revprops
    possible_master_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 282, in _get_nick
    master = self.get_master_branch(possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 155, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 2548, in get_master_branch
    possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 2557, in _get_master_branch
    possible_transports=possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 187, in open
    possible_transports=possible_transports)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/remote.py", line 519, in open_branch
    branch_path = self._determine_relpath(name)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/remote.py", line 444, in _determine_relpath
    layout = repos.get_layout()
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/repository.py", line 736, in get_layout
    return self.get_layout_source()[0]
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/repository.py", line 757, in get_layout_source
    self._find_guessed_layout(self.get_config_stack())
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/repository.py", line 780, in _find_guessed_layout
    revnum, self._hinted_branch_path)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/layout/guess.py", line 147, in repository_guess_layout
    branch_path=branch_path)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/layout/guess.py", line 154, in logwalker_guess_layout
    max(0, revnum-GUESS_SAMPLE_SIZE)), revnum, branch_path)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/layout/guess.py", line 104, in guess_layout_from_history
    for (revpaths, revnum, revprops) in changed_paths:
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/logwalker.py", line 59, in iter_all_changes
    revpaths = get_revision_paths(revnum)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/logwalker.py", line 294, in get_revision_paths
    return self.cache.get_revision_paths(revnum)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/cache/tdbcache.py", line 187, in get_revision_paths
    raise KeyError("missing revision paths for %d" % revnum)
KeyError: 'missing revision paths for 11863'

bzr 2.6b2 on python 2.7.3 (Linux-3.5.0-17-generic-x86_64-with-
    LinuxMint-14-nadia)
arguments: ['/usr/bin/bzr', 'ci']
plugins: bash_completion[2.6b2], changelog_merge[2.6b2], explorer[1.3.0],
    git[0.6.9], launchpad[2.6b2], netrc_credential_store[2.6b2],
    news_merge[2.6b2], po_merge[2.6b2], qbzr[0.22.2], svn[1.2.1],
    weave_fmt[2.6b2]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'ru_RU.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.